Multiple regenerative loop antenna and circuit



Jane 1, 19.24 1,479,638

V. K. ZWORYKIN MULTIPLE REGENERATIVE LOOP ANTENNA AND CIRCUIT Filed Aug.28.1922

Patented Jan. 1, 1924.

UNITED STATES VLADIMIR K. ZWORYKIN, OF KANSAS CITY, MISSOURI.

MULTIPLE REGENERATIVE LOOP ANTENNA AND CIRCUIT.

Application filed August 28, 1922. Serial No. 584,717.

To all whom it may concern:

Be it known that I, VLADIMIR K. ZJWORY- KIN, a citizen of the Republicof Russia, and resident of Kansas City, county of Jackson, State of"Missouri, have invented a certain new and useful Improvement in MultipleRegenerative Loop Antennae and Circuits, of which the following is acomplete specification.

The present invention relates to radio receiving apparatus, and aims todevise a novelmultiple receiving loop construction adapted to produce aregenerative effect and also to afford a simpler and more convenientmeans for tuning.

To this end I provide a plurality of antenna loops, all designed to actas receiving loops and so arranged as to mutually influence each otherfor creating a multiple regenerative effect. The arrangement of theloops is also designed to enable the tuning of the receiving circuit tobe carried out without'afi'ecting the directional properties of theloops or interfering with each of them receiving the maximum energy ofthe si als.

modified arrangement of the receiving loop connections. I

Referring now to the drawing in detail, this illustrates a receivingcircuit including a pair of vacuum tubes 3 and a set of three receivingloops, namely a main receiving loop L, in the grid circuit 4 of saidtubes, and two loops L and L" in the plate circuits 5 and,5'respectively, all three loops being permanently coupled in properrelation, the shape and particular relative mounting of the loops beingimmaterial so long as each loop is properly tuned and directed to thesignals being received. For this purpose each loop may be provided witha variable condenser 6, although a single variable condenser can be usedin connection with the main receiving loop L and constant condensers inconnection with the loops L and L", the loop L being permanentlyclose-coupled with the two other,

loops and all three mutually influencing each other.

' By means of this circuit a novel re nerative effect is produced in amanner w ich is not simply a modification of the wellknown regenerativecircuit. In the ordinary circuit the energy received is fed back to themain circuit for producing the regenerative and heterodyne eflect, whilein the present case the energy is received by all the loops,respectively, and these influence each other and produce multipleregenerative actions, according to the number of loops employed, By thecircuit just described, the two-tube connection provides a doubleregenerative effect, and by the use of a single variable condenser 6 forthe loop L the tuning of the entire apparatus may be properly carriedout without interfering with the directional property of the entire setof receiving loops.

Referring now to Figure 2, this illustrates a single vacuum tubearrangement with the plate circuit 5 inductively coupled, as indicatedat 8, with the receivin oops L and L", and these latter being, as fore,coupled with the main receiving 100 L of the grid circuit4, As inthepreviously descrlbed circuit, all the loops receive the signals, andmutually influence each other with the result of producing a multipleregenerative eifect; and by employing a single variable condenser 6 inthe circuit of the main receiving loop L with constant condensers inconnection with the other loops, the entire receiving apparatus may betuned without effecting the directional property of the loop set or theefficiency of each loop for responding with maximum effect to the fullstrength of the signals.

While the foregoing shows representative circuit arrangements forembodylng the proposed features of improvement, I desire to reserve theright to make all such changes and modifications as may fairly andproperly fall within the scope of the appended claims.

What I claim is:

1. In a radio receivin apparatus, a.

vacuum tube, and a multip eloop antenna.

structure having one of its 100 s connected with the grid circuit of saitube and lll' ltd

coupled With two or more loops in the plate circuit of said tube.

2. In a radio receiving apparatus, a vacuum tube, and a plurality ofantenna loops each operating to receive the signals and all permanentlycoupled for mutual regenerative efiect, one of said loops beingconnected in the grid circuit of said tube and the remainder of saidloops being coupled With the plate circuit of said tube 3. lln a radioreceiving apparatus, a vacuum tube, and a plurality of antenna loopseach operating to receive the signals and all permanently coupled formutual regenerative efiect, one of said loops being connected in thegrid circuit ofsaid tube and the remainder of said loops beinginductively coupled with the plate circuit of said tubes,

4. In a radio receiving apparatus, a vacuum tube, and a plurality ofantenna loops each operating to receive the signals and all permanentlycoupled for mutual regenerative effect, one of said loops beingconnected in the grid circuit of said tube and the remainder of saidloops being coupled With the plate circuit of said tubes, and a singlevariable condenser associated with one of said loops for the tuning ofthe apparatus.

In Witness whereof I hereunto afix my signature.

VLAlDlMlR K. ZWORYKIN.

